Strange Bedfellows (2004)

60 year-old Ralph Williams and his best mate Vince have money problems. After reading about a new legislation passed giving same-sex couples equal tax breaks to married folk, Vince persuades Ralph they should register as a same-sex couple. However, they find out an investigator is coming to audit their claim. Now they have a week to learn how to pose as a loving homosexual couple.

Official website: http://www.strangebedfellows.com.au